StoredSortedMap.java

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: StoredSortedMap.java,v 12.2 2005/10/05 20:40:10 mark Exp $
 */

package com.sleepycat.collections;

import java.util.Comparator;
import java.util.SortedMap;

import com.sleepycat.bind.EntityBinding;
import com.sleepycat.bind.EntryBinding;
import com.sleepycat.db.Database;
import com.sleepycat.db.OperationStatus;

public class StoredSortedMap extends StoredMap implements SortedMap {

    public StoredSortedMap(Database database, EntryBinding keyBinding,
                           EntryBinding valueBinding, boolean writeAllowed) {

        super(new DataView(database, keyBinding, valueBinding, null,
                           writeAllowed, null));
    }

    public StoredSortedMap(Database database, EntryBinding keyBinding,
                           EntryBinding valueBinding,
                           PrimaryKeyAssigner keyAssigner) {

        super(new DataView(database, keyBinding, valueBinding, null,
                           true, keyAssigner));
    }

    public StoredSortedMap(Database database, EntryBinding keyBinding,
                           EntityBinding valueEntityBinding,
                           boolean writeAllowed) {

        super(new DataView(database, keyBinding, null, valueEntityBinding,
                           writeAllowed, null));
    }

    public StoredSortedMap(Database database, EntryBinding keyBinding,
                           EntityBinding valueEntityBinding, 
                           PrimaryKeyAssigner keyAssigner) {

        super(new DataView(database, keyBinding, null, valueEntityBinding,
                           true, keyAssigner));
    }

    StoredSortedMap(DataView mapView) {

        super(mapView);
    }

    public Comparator comparator() {

        return null;
    }

    public Object firstKey() {

        return getFirstOrLastKey(true);
    }

    public Object lastKey() {

        return getFirstOrLastKey(false);
    }

    private Object getFirstOrLastKey(boolean doGetFirst) {

        DataCursor cursor = null;
        try {
            cursor = new DataCursor(view, false);
            OperationStatus status;
            if (doGetFirst) {
                status = cursor.getFirst(false);
            } else {
                status = cursor.getLast(false);
            }
            return (status == OperationStatus.SUCCESS) ?
                    cursor.getCurrentKey() : null;
        } catch (Exception e) {
            throw StoredContainer.convertException(e);
        } finally {
            closeCursor(cursor);
        }
    }

    public SortedMap headMap(Object toKey) {

        return subMap(null, false, toKey, false);
    }

    public SortedMap headMap(Object toKey, boolean toInclusive) {

        return subMap(null, false, toKey, toInclusive);
    }

    public SortedMap tailMap(Object fromKey) {

        return subMap(fromKey, true, null, false);
    }

    public SortedMap tailMap(Object fromKey, boolean fromInclusive) {

        return subMap(fromKey, fromInclusive, null, false);
    }

    public SortedMap subMap(Object fromKey, Object toKey) {

        return subMap(fromKey, true, toKey, false);
    }

    public SortedMap subMap(Object fromKey, boolean fromInclusive,
                            Object toKey, boolean toInclusive) {

        try {
            return new StoredSortedMap(
               view.subView(fromKey, fromInclusive, toKey, toInclusive, null));
        } catch (Exception e) {
            throw StoredContainer.convertException(e);
        }
    }
}

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